What vitamins do rats need? He’s fed ratrations number 7 and currently has calcivet in his water. Does he need anything else or will he get most vitamins in his diet?
There is information regarding the nutritional requirements of rats in the Reference Thread.
You could compare that information to the rat block you are feeding.
Rats also require a variety of daily vegs and healthy treats s detailed in the Reference thread https://www.ratshackforum.com/threads/reference-thread-read-only.35894/
A good rat block will contain all the nutrition rats require but I was unable to find specific information about what you are feeding so I can't speak to it specifically